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Question

i'm actually trying to do add an element to an ListBox wich is in the Owner Window

I tried to use the Owner Windows property but i can't access my ListBox.

Window parent = this.Owner;
parent.toto.Items.Add();

I also tried to add a public property in my Owner Window class (and add the item on the set method), but i can't access it neither.

Answer 1

The type of the Owner property is Window . The compiler doesn't know that it is actually the type you created. If you perform a cast, and your ListBox is exposed publicly , you should be able to access it:

YourWindowType parent = (YourWindowType)this.Owner;
parent.toto.Items.Add(...);

Answer 2

尝试

Window parent = this.ActiveForm;